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Journal articles on the topic 'DP980'

Author: Grafiati

Published: 4 June 2021

Last updated: 27 April 2022

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1

Panich, Sansot. "Constitutive Modeling of Advanced High Strength Steels Characterized by Uniaxial and Biaxial Experiments." Advanced Materials Research 849 (November 2013): 207–11. http://dx.doi.org/10.4028/www.scientific.net/amr.849.207.

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Anisotropic plastic behavior of advanced high strength steel sheets of grade DP780 and DP980 were investigated using three different yield functions, namely, the von Mises, Hills 48 and Barlat2000 (Yld2000-2d) criteria. Uniaxial tensile and balanced biaxial (hydraulic bulge) tests were conducted for the examined steels in order to characterize flow behavior and plastic anisotropy for different stress states. Additionally, disk compression and In-plane biaxial tension tests were performed for obtaining balanced r-value of DP780 and DP980, respectively. All these data were used to determine the anisotropic coefficients. According to the different yield criteria, yield stresses and r-values for different directions were calculated corresponding to these yield criteria. The results were compared with experimental data. It was found that the Yld2000-2d model precisely predict well with experimental data than the other models.

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2

Phaoniam, Rittichai, Jesada Kaewwichit, and Komgrit Lawanwong. "Comparative study of dissimilar tailor-welded blanks between DP590 and DP980 dual phase steels." MATEC Web of Conferences 192 (2018): 01041. http://dx.doi.org/10.1051/matecconf/201819201041.

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This research aims to study the dissimilar tailor-welded blanks between DP590 and DP980 dual phase steels using the autonomous GTAW process. The summarized results are as follows. It was found that utilized welding parameters in DP590 and DP980 steel butt joint were able to achieve complete penetration joint and there were not any defects. Furthermore, the dissimilar weld zone produced the hardness profilevalue between the DP590 and DP980 base metal. In particularly, DP590-HAZ region resulted in harden zone. Meanwhile, DP980-HAZ region induced a soften zone. By the way, the harden DP590-HAZ exhibited fine columnar martensite with a ferrite matrix. On the other hand, the soften DP980-HAZ represented a tempered martensite structures. Comparing the tensile test was carried out in order to investigate dissimilar welded joint strength in the different rolling directions. It was suggested that the specimen welded along to rolling direction was evidently larger tensile strength (1092 MPa) than the welding transverse to rolling direction (638 MPa). Moreover, the weakest fracture occurred apparently on the region of DP590-BM rather than the HAZ region.

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3

Feng, Qiao Bo, Yun Feng Zhu, and He Xin Zhao. "Research on Resistance Spot Welding of DP980 Dual Phase Steel." Advanced Materials Research 860-863 (December 2013): 780–83. http://dx.doi.org/10.4028/www.scientific.net/amr.860-863.780.

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The process parameters and quality of resistance spot welding for DP980 dual phase steel were studied through the orthogonal experiment method, and the influence of welding current, welding time and electrode force on the strength of welding joint has been discussed. The results show that the welding current has the greatest influence on the quality of welding joint for DP980 dual phase steel, and it needs relatively lower welding current for the DP980 dual phase steel as it has high resistivity, and appropriate increasing of electrode force is a feasible way to avoid the defect of shrinkage and it improves the joint strength.

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4

Park, Namsu, and Hoon Huh. "Prediction of Fracture Strains for DP980 Steel Sheets Using a Modified Lou–Huh Ductile Fracture Criterion." Key Engineering Materials 626 (August 2014): 347–52. http://dx.doi.org/10.4028/www.scientific.net/kem.626.347.

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This paper is concerned with the prediction of fracture strains for DP980 steel sheets using a modified Lou–Huh ductile fracture criterion. The usage of DP980 steel is significantly increasing in the automotive industry for weight reduction, enhancement of crashworthiness and safety of car body. The material behavior of AHSS show unpredictable and sudden fracture during sheet metal forming process. A modified Lou–Huh ductile fracture criterion is utilized to predict the formability of AHSS because the conventional FLD constructed based on necking is unable to evaluate the formability of AHSS. Fracture loci were extracted from 3D fracture envelopes by assuming the plane stress condition to evaluate equivalent plastic strain up to the point of fracture at a wide range of loading paths. Three different types of specimens such as pure shear, dog-bone and plane strain grooved specimens were used for tensile tests to construct 3D fracture envelopes of DP980. Fracture strain of each loading path was evaluated to show that there is little deviation between predicted fracture strains and experimentally acquired ones. From the comparison, it is concluded that the 3D fracture envelopes can accurately predict the onset of the fracture of DP980 steel sheets in complicated loading conditions including the pure shear condition.

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5

Zhumagulov, Amir, Armin Abedini, Taamjeed Rahmaann, José Imbert, Clifford Butcher, Michael Worswick, Skye Malcolm, Jim Dykeman, and Hesham Ezzat. "High Rate Characterization of Three DP980 Steels." EPJ Web of Conferences 183 (2018): 02060. http://dx.doi.org/10.1051/epjconf/201818302060.

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Advanced high strength steels (AHSS) are used extensively in the automotive industry in the ongoing effort to reduce vehicle weight. Their increased strength allows for the reduction of sheet thickness, and thus a reduction in mass, while offering formability and cost advantages when compared to other metal alloys typically considered for lightweight applications. DP980 steels are AHSS being considered for structural energy absorbing components; however, there is a lack of published information on their high rate behaviour. This paper presents the results of an experimental program that characterized three production DP980 steels from three different manufacturers at strain rates of 0.001, 1, 10, 100 and 1,000 s-1. An electro-mechanical frame was used for the quasi-static tests, the 1, 10, and 100 s-1 tests were carried out using a fast hydraulic apparatus and the 1,000 s-1 experiments were carried out using a tensile split Hopkinson bar. The quasi-static hardening response at strains higher than the uniform elongation of about 7% was obtained by using a shear test, thus avoiding the use of inverse modelling techniques. The results indicate that the DP980 steels are moderately rate sensitive, with one of the materials showing higher sensitivity than the others. One of the materials exhibited a yield point phenomenon that appears to affect the behaviour of the material at 100 and 1,000 s-1, however, the reasons for this behaviour remain an open question. The data was fit to modified Johnson-Cook and Cowper-Symonds model to account for rate sensitivity. The results presented in this paper provide a tool for modelling the dynamic behaviour of DP980 steels.

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6

Gao, Shuling, Yuntao Li, Lijun Yang, and Wencong Qiu. "Microstructure and mechanical properties of laser-welded dissimilar DP780 and DP980 high-strength steel joints." Materials Science and Engineering: A 720 (March 2018): 117–29. http://dx.doi.org/10.1016/j.msea.2018.02.057.

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7

Rosado-Carrasco, Juliana G., Walter F. González-Zapatero, Christian J. García, César M. Gómora, David Jaramillo, and Ricardo R. Ambriz. "Analysis of the Low Cycle Fatigue Behavior of DP980 Steel Gas Metal Arc Welded Joints." Metals 12, no. 3 (February 27, 2022): 419. http://dx.doi.org/10.3390/met12030419.

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Dual phase (DP) steels have high strength, while maintaining outstanding elongation capacities. This is possible using a well-controlled thermomechanical process that produces a perfect phase combination in the DP microstructures. However, automotive makers are required to weld the DP steels, which generates a soft zone in the microstructure. In this work, 1.6 mm-thick DP980 steel sheets were welded by gas metal arc welding process to analyze the response of the welded soft zone to cyclic loading conditions. Conducted macrographic and metallography analyses revealed good quality in the appearance of the welded joints, with a complete fusion of the DP980 joint and without the presence of discontinuities. Low cycle fatigue tests of the DP welded joints were conducted under a constant amplitude strain control mode. The welded joints experienced a fatigue life reduction with respect to the DP980 steel of ~16% at strain amplitudes of 0.2, 0.3, and 0.4%. For strain amplitudes larger than 0.6%, the fatigue life of the welded joint was reduced by 39%. Weld thermal cycles combined with metallography analysis indicated that a tempered process of the martensite during the welding was responsible for the soft-zone formation and the poor fatigue response.

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8

Li, Haijun, Tianxiang Li, Chaofei Li, Zhaodong Wang, and Guodong Wang. "Improvement of Longitudinal Performance Uniformity of Hot-Rolled Coils for Cold-Rolled DP980 Steel." Metals 10, no. 3 (March 17, 2020): 382. http://dx.doi.org/10.3390/met10030382.

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Cold-rolled DP980 steel is widely used in the automobile industry. Hot-rolled coil is the raw material of cold-rolled DP980 steel, the head and tail parts of which are usually obviously stronger than the body part. The objective of this study is to improve the longitudinal performance uniformity of hot-rolled coils. The material properties of this steel, such as the dynamic continuous cooling transformation, the influence of the cooling mode before coiling, the cooling rate during coil cooling on the microstructure, and mechanical properties of cold-rolled DP980 steel were investigated through thermal simulation experiments and hot rolling experiments. Meanwhile, the temperature field of hot-rolled coil was analyzed using ABAQUS software, which was used to survey the cause of the longitudinal performance fluctuations of hot-rolled coils, combined with an investigation of the aforementioned material properties. The results illustrate that the average cooling rate of the head and tail parts are higher than that of the body part during coil cooling, which causes the longitudinal performance fluctuation of hot-rolled coils. Based on the temperature field of hot-rolled coil, obtained by FEM, the parameters of the U-shaped cooling process were optimized and used in industrial applications.

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9

Marya, Manuel, Kathy Wang, Louis G. Hector, and Xiaohong Gayden. "Tensile-Shear Forces and Fracture Modes in Single and Multiple Weld Specimens in Dual-Phase Steels." Journal of Manufacturing Science and Engineering 128, no. 1 (August 30, 2005): 287–98. http://dx.doi.org/10.1115/1.2137751.

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In this article, weld fracture criteria based upon low strain rate (i.e., ε̇∼10−3-10−2s−1) tensile-shear tests of spot welds in dual-phase (DP) steels DP600, DP780, and DP980 are developed. Three empirical equations are inferred from least-squares root-fitting analyses of tensile-shear testing data. Building upon existing results in the literature, the first equation relates the tensile-shear force to the weld diameter. The second and third equations relate, respectively, a critical weld diameter and a critical tensile-shear force for interfacial fracture to the sheet thickness and hardness extrema in the heat-affected zone. These idealized equations can serve as the basis for further development of fracture criteria resembling material flow laws that account for higher strain rates and more complicated deformation paths. The effect of spot-weld placement in specific patterns or arrays on deformation and fracture behavior was also investigated to explore underlying effects from deformation field interactions between adjacent spot welds.

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10

Pan, Libo, Wen Tan, Wenqiang Zhou, and Junlin Wang. "Development of a DP980 steel with low cooling rate requirement." E3S Web of Conferences 245 (2021): 01003. http://dx.doi.org/10.1051/e3sconf/202124501003.

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DP980 is a promising light-weightening material in car body. To avoid high investment of strong cooling system, a new DP980 steel with low cooling rate requirement was developed. The mechanical properties and microstructure were analyzed under different manufacturing process. It could be concluded that the chemical composition design should be reasonable and of low cost to achieve both high strength and also austenite to martensite transformation at low cooling rate. Strength increased with coiling temperature decreasing during hot rolling, and higher annealing temperature and lower over aging temperature were favourable to higher strength. The austenite-martensite transforming could be completed at even lower rapid cooling rate of 20°C/s. Through optimized manufacturing process parameters, the new DP steel product with good mechanical properties could be obtained successfully, which provided a new option for normal production line to produce ultra high strength steel.

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11

Zhang, Fan, Annie Ruimi, and David P. Field. "Phase Identification of Dual-Phase (DP980) Steels by Electron Backscatter Diffraction and Nanoindentation Techniques." Microscopy and Microanalysis 22, no. 1 (January 19, 2016): 99–107. http://dx.doi.org/10.1017/s1431927615015779.

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AbstractPhase identification of multi-phase materials provides essential information relating the material to its mechanical properties. In this study we selected DP980, a type of dual-phase steel, to investigate the content of martensite and ferrite grains. A combination of advanced techniques was used to provide detailed and precise information of the microstructure. Scanning and transmission electron microscopy were used to provide observations of the sample surface at different scales. Martensite and ferrite phases of DP980 were further identified and characterized using electron backscatter diffraction and scanning probe microscopy. Results obtained with nanoindentation tests confirmed that the differences in nanohardness values in single-phase grains are martensite and ferrite with different surface heights shown by scanning probe microscopy. The similarity shown in the image quality map and scanning probe microscopy proves that a large fraction of martensite can be distinguished in this undeformed material using image quality parameters obtained during electron backscatter diffraction imaging.

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12

Di, Hongshuang, Qian Sun, Xiaonan Wang, and Jianping Li. "Microstructure and properties in dissimilar/similar weld joints between DP780 and DP980 steels processed by fiber laser welding." Journal of Materials Science & Technology 33, no. 12 (December 2017): 1561–71. http://dx.doi.org/10.1016/j.jmst.2017.09.001.

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13

Yang, Lijun, Shuling Gao, Yiming Huang, Mingsheng Sun, and Yuntao Li. "Effect of microstructure on tensile and fatigue properties of laser-welded DP780 and DP980 high-strength steel joints." Materials Science and Engineering: A 754 (April 2019): 535–55. http://dx.doi.org/10.1016/j.msea.2019.03.062.

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14

Ho, Ming Hsiung, Pin Ning Wang, Yi Kai Lin, Chih Yi Chang, and Ping Chen Shen. "The Shear Properties of DP980 High Strength Steel Plate." Applied Mechanics and Materials 552 (June 2014): 335–40. http://dx.doi.org/10.4028/www.scientific.net/amm.552.335.

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In this study, the high strength steel DP980 material shear properties were investigated. In the design process, first of all based on literature paper and test specimen optimal size requirements, and then find ways to meet the current test equipment maximum capacity (100 kN). The Studies completed DP980 1.4 mm specimens of tensile test, one-way shear test and forward and reverse shear loading experiments. Limited by the maximum output of the machine capacity 100 kN, the thickness 1.4 mm steel plate with strain gage measurements under unidirectional force generated by experiments at the maximum shear strain of 9.890%. And the forward and reverse biased loading method, the completion of seven Bauschinger shear stress-shear strain curves. In the unidirectional shear test results, first verify that the elastic region of the shear elastic modulus of 74.7 GPa, in line with the basic properties of steel materials. Then the shear stress-shear strain curve is converted to stress-strain curve relationship. Wherein the shear stress-shear plastic portion of the curve was converted by factor 1.81, there is overlap between the tensile and shear experimental results confirm rationality.

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15

Huang, T., Y. S. Sato, H. Kokawa, M. P. Miles, K. Kohkonen, B. Siemssen, R. J. Steel, and S. Packer. "Microstructural Evolution of DP980 Steel during Friction Bit Joining." Metallurgical and Materials Transactions A 40, no. 12 (October 14, 2009): 2994–3000. http://dx.doi.org/10.1007/s11661-009-0016-x.

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16

Wang Jinfeng, 王金凤, 房宇 Fang Yu, 李兵 Li Bin, and 张俊 Zhang Jun. "Properties of Laser Tailor-Welded Joints of DP980 and 22MnB5." Laser & Optoelectronics Progress 55, no. 2 (2018): 021410. http://dx.doi.org/10.3788/lop55.021410.

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17

Kim, J. H., G. S. Kang, H. S. Lee, J. H. Kim, and B. M. Kim. "Spring-back Prediction of DP980 Steel Sheet Using a Yield Function with a Hardening Model." Transactions of Materials Processing 25, no. 3 (June 1, 2016): 189–94. http://dx.doi.org/10.5228/kstp.2016.25.3.189.

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18

Park, N., and H. Huh. "Prediction of Fracture Strains for DP980 Steel Sheets for a Wide Range of Loading Paths." Transactions of Materials Processing 24, no. 3 (June 1, 2015): 176–80. http://dx.doi.org/10.5228/kstp.24.3.176.

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19

Mehrabi, Hamed, Richard (Chunhui) Yang, and Baolin Wang. "Effects of Tension–Compression Asymmetry on Bending of Steels." Applied Sciences 10, no. 9 (May 11, 2020): 3339. http://dx.doi.org/10.3390/app10093339.

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Stainless steels (SUS) and dual-phase (DP) steels have tension-compression asymmetry (TCA) in mechanical responses to full loading cycles. This phenomenon can significantly influence sheet metal forming of such metals, however, it is difficult to describe this behaviour analytically. In this research, a novel analytical method for asymmetric elastic-plastic pure bending using the Cazacu–Barlat 2004 asymmetric yield function is proposed. It only uses material parameters in tension along with an asymmetry coefficient related to the yield function. Bending operations of SUS304 and DP980 are investigated as two case studies. In the pure bending for both SUS304 and DP980, moment–curvature diagrams are analytically obtained. Furthermore, linear and nonlinear springback behaviours of SUS304 are analytically investigated. Moreover, using the analytical model as a user-defined material, a numerical model is developed for both steels under pure bending. In the V-bending case of SUS304 with and without TCA effects, the springback behaviours of the material are investigated numerically. In addition, considering friction effects, the analytical method is further modified for predicting springback behaviours in the V-bending of 16 types of SUS304 with various strengths are determined. All the analytical and numerical results have good agreement with those experimental results from literature for validation.

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20

Troufflard, Julien, Guillermo Requena, Sandrine Thuillier, and Éric Maire. "Ductile Damage in Tension and Bending for DP980 Steel Sheets." Key Engineering Materials 554-557 (June 2013): 110–17. http://dx.doi.org/10.4028/www.scientific.net/kem.554-557.110.

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The mechanical behavior of DP980 steel sheets of 1.7 mm thickness has been investigated with both tensile and bending tests. Free bending tests were performed on square samples of 60mm side. The bending tool has a sharp radius of around 0.4 mm and the sample simply lies on two rollers. Scanning electron micrography observations were performed in order to check the occurrence of cracks, that indicate the onset of rupture in bending. Moreover, X-ray microtomography observations were performed on smooth and notched tensile specimen, with a specific small-size geometry, and bending specimen. Maximum void volume fractions of 1.5 10-3were recorded and the influence of the triaxiality ratio was investigated, by changing the notch radius. In the case of bending, samples were cut in the bent area and void volume fraction distribution was analyzed along the sheet thickness. Material parameters for Gurson-Tvergaard-Needleman (GTN) model, associated with isotropic hardening and von Mises yield criterion, were identified from the tensile tests. Inverse identification was performed over the different sample geometries, showing that GTN model can not capture the triaxiality ratio influence. Finite element simulations of the bending test were then carried out, in order to compare experimental and predicted void volume fractions in the sheet thickness.

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21

Song, J. H., Y. Zhang, J. S. Lee, S. J. Park, D. S. Choi, and G. A. Lee. "Bending Characteristics of DP980 Steel Sheets by the Laser Irradiation." Transactions of Materials Processing 21, no. 6 (October 1, 2012): 378–83. http://dx.doi.org/10.5228/kstp.2012.21.6.378.

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22

Ren, Daxin, Dewang Zhao, Kunmin Zhao, Liming Liu, and Zhubin He. "Resistance ceramic-filled annular welding of DP980 high-strength steel." Materials & Design 183 (December 2019): 108118. http://dx.doi.org/10.1016/j.matdes.2019.108118.

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23

Ji, Xiu-lin, Ju-yi Wang, Cui-cui Ji, and Jian-hua Zhao. "Abrasive wear resistance of dual phase steels DP980 and DP600." Journal of Iron and Steel Research International 22, no. 4 (April 2015): 317–23. http://dx.doi.org/10.1016/s1006-706x(15)30006-6.

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24

Zhang, Ya Jing, Jong-Bong Kim, Jung Han Song, Geun An Lee, Hye Jin Lee, and Nak Kyu Lee. "FEM analysis for laser bending process of DP980 steel sheet." International Journal of Precision Engineering and Manufacturing 16, no. 2 (February 2015): 315–21. http://dx.doi.org/10.1007/s12541-015-0042-0.

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25

Lin, S. W., Z. C. Luo, L. J. Li, Z. W. Peng, and J. X. Gao. "Influence of intercritical temperature on microstructure of cold rolled DP980." Journal of Physics: Conference Series 2044, no. 1 (October 1, 2021): 012082. http://dx.doi.org/10.1088/1742-6596/2044/1/012082.

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26

Zhao, Wei, Yu Yan, Hai Bo Wang, and Jin Feng Gao. "Finite Element Analysis and Fracture Forecast of U Channel Flexible Roll Forming." Advanced Materials Research 683 (April 2013): 604–7. http://dx.doi.org/10.4028/www.scientific.net/amr.683.604.

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Focus on fracture defect of DP980 in Flexible roll forming, this research have done a finite-element analysis based on explicit solver and shear damage criterion, and using element deletion of finite element software ABAQUS to realize the fracture evolution of sheet damaged area. During the modeling, parameters of fracture evolution are set, and finally gain the conclusion about the relationship between stress, strain, energy density and fracture. The research provides theoretical guidance for practical production.

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27

Taniguchi, Koichi, Yong Chae Lim, Alexis Flores-Betancourt, and Zhili Feng. "Transient Microstructure Evolutions and Local Properties of Dual-Phase 980 MPa Grade Steel Via Friction Stir Spot Processing." Materials 13, no. 19 (October 2, 2020): 4406. http://dx.doi.org/10.3390/ma13194406.

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Friction stir processing is a novel solid-state process to modify microstructures and their properties by intense, localized plastic deformation. However, little research has been reported for microstructure evolutions of advanced high-strength steels during the process. The present work focuses on the study of transient microstructure changes and local mechanical properties for friction stir spot processed dual-phase (DP) 980 MPa grade steel (DP980) under different peak temperatures. A pinless silicon nitride ceramic tool was used to produce relatively simple material deformation and flow near the tool. Friction stir spot processed steel samples were characterized by optical and electron microscopies. Furthermore, Vickers microhardness and nano-indentation measurements were used to study local mechanical properties for correlation with microstructures. A swallow layer of refined grains (<0.6 µm) was obtained with a low peak temperature (under 400 °C), whereas higher peak temperatures (>Ac1) led to a change in grain size with different microstructures (fine-grained DP or martensite). Electron back-scattered diffraction characterizations revealed a large deformation in the as-received microstructures (mixture of ferrite and tempered martensite) induced by friction stir spot processing, leading to recrystallization and grain refinement around the stirred zone. Also, nano-indentation measurements showed a higher hardness than the hardness of the as-received DP980. Friction stir processing with different process conditions effectively changed microstructures and local mechanical properties.

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28

Manimaran, G., A. K. Lakshminarayanan, and S. Balaji. "Understanding the Parameters Controlling the Resistance Spot Welding of DP980 Steel." Applied Mechanics and Materials 787 (August 2015): 411–15. http://dx.doi.org/10.4028/www.scientific.net/amm.787.411.

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Empirical relationships were developed between the resistance spot welding process parameters (i.e. power, time and electrode force) and quality characteristics (i.e., tensile shear failure load and nugget diameter) of resistance spot welded DP980 steel joints. Further, the process parameters were optimized to get maximum tensile shear failure load and optimum nugget diameter. It is observed that, the electrode force of 4.25 kg/cm2, power of 70 kW and welding time of 3.5 sec yielded a maximum tensile shear failure load of 39 kN with an optimum weld nugget diameter of 4.58 mm.

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29

Nasheralahkami, Saeid, Sergey Golovashchenko, Scott Dawson, and Raj Sohmshetty. "Analysis of Tool Wear for Trimming of DP980 Sheet Metal Blanks." SAE International Journal of Engines 10, no. 2 (March 28, 2017): 233–38. http://dx.doi.org/10.4271/2017-01-0302.

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30

Cui, Q. L., D. Parkes, D. Westerbaan, S. S. Nayak, Y. Zhou, D. Liu, F. Goodwin, S. Bhole, and D. L. Chen. "Effect of coating on fiber laser welded joints of DP980 steels." Materials & Design 90 (January 2016): 516–23. http://dx.doi.org/10.1016/j.matdes.2015.10.098.

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31

Ferreira, Caroline Cristine de Andrade, Vagner Braga, Rafael Humberto Mota de Siqueira, Sheila Medeiros de Carvalho, and Milton Sergio Fernandes de Lima. "Laser beam welding of DP980 dual phase steel at high temperatures." Optics & Laser Technology 124 (April 2020): 105964. http://dx.doi.org/10.1016/j.optlastec.2019.105964.

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32

Taylor, M. D., K. S. Choi, X. Sun, D. K. Matlock, C. E. Packard, L. Xu, and F. Barlat. "Correlations between nanoindentation hardness and macroscopic mechanical properties in DP980 steels." Materials Science and Engineering: A 597 (March 2014): 431–39. http://dx.doi.org/10.1016/j.msea.2013.12.084.

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33

Xie, Huanyang, Xianghuai Dong, Kai Liu, Zhenqiu Ai, Fang Peng, Qian Wang, Fei Chen, and Jianfeng Wang. "Experimental investigation on electroplastic effect of DP980 advanced high strength steel." Materials Science and Engineering: A 637 (June 2015): 23–28. http://dx.doi.org/10.1016/j.msea.2015.04.016.

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34

Han, Yun, Liang Chen, Shuang Kuang, and Chunqian Xie. "Investigation on Hydrogen-Induced Delayed Fracture of Cold-Rolled DP980 Steels." Journal of Materials Engineering and Performance 26, no. 5 (March 24, 2017): 2024–31. http://dx.doi.org/10.1007/s11665-017-2636-4.

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35

Choi, Jisik, Jinwoo Lee, Gihyun Bae, Frederic Barlat, and Myoung-Gyu Lee. "Evaluation of Springback for DP980 S Rail Using Anisotropic Hardening Models." JOM 68, no. 7 (April 22, 2016): 1850–57. http://dx.doi.org/10.1007/s11837-016-1924-z.

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36

Wang, Haibo, Yu Yan, Fanghui Jia, and Fei Han. "Investigations of fracture on DP980 steel sheet in roll forming process." Journal of Manufacturing Processes 22 (April 2016): 177–84. http://dx.doi.org/10.1016/j.jmapro.2016.03.008.

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37

Zhang, Yajing, Wenbin Dong, Tuoyu Yang, Chun Guo, and Feng Chen. "Edge effect reduction in laser bending of DP980 high-strength steel." International Journal of Advanced Manufacturing Technology 119, no. 3-4 (December 2, 2021): 1965–73. http://dx.doi.org/10.1007/s00170-021-08424-1.

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38

Zhai Zhanjiang, 翟战江, 赵琳 Zhao Lin, 彭云 Peng Yun, 朱姣 Zhu Jiao, and 曹洋 Cao Yang. "DP980钢激光焊接接头的低周疲劳性能." Chinese Journal of Lasers 48, no. 18 (2021): 1802003. http://dx.doi.org/10.3788/cjl202148.1802003.

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39

Song, Jung Han, Jong Sup Lee, Geun An Lee, and Sung Jun Park. "Finite Element Simulation Modelling for Laser Irradiated Bending Process of DP980 Steel." Advanced Materials Research 538-541 (June 2012): 1878–82. http://dx.doi.org/10.4028/www.scientific.net/amr.538-541.1878.

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Laser forming involves heating sheet metal workpiece along a certain path with a defocused laser beam directed irradiate to the surface. During laser forming, a transient temperature fields is caused by the irradiation and travelling of a laser beam. Consequently, thermal expansion and contraction take place, and allows the thermal-mechanical forming of complex shapes. This is a new manufacturing technique that forming metal sheet only by thermal stress. Therefore, the analysis of temperature fields and stress fields are very useful for studying the forming mechanism and controlling the accuracy of laser forming. The non-liner finite element solver, ABAQUS, is employed to solve the thermal-mechanical analysis. Using this model, the temperature and stress distribution of DP980 are analyzed. Numerical results agree well with the experimental results.

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Bandyopadhyay, K., S. K. Panda, P. Saha, V. H. Baltazar-Hernandez, and Y. N. Zhou. "Microstructures and failure analyses of DP980 laser welded blanks in formability context." Materials Science and Engineering: A 652 (January 2016): 250–63. http://dx.doi.org/10.1016/j.msea.2015.11.091.

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Ch.Darabi, A., H. R. Chamani, J. Kadkhodapour, A. P. Anaraki, A. Alaie, and M. R. Ayatollahi. "Micromechanical analysis of two heat-treated dual phase steels: DP800 and DP980." Mechanics of Materials 110 (July 2017): 68–83. http://dx.doi.org/10.1016/j.mechmat.2017.04.009.

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Pouranvari, M., and S. P. H. Marashi. "On failure mode of resistance spot welded DP980 advanced high strength steel." Canadian Metallurgical Quarterly 51, no. 4 (October 2012): 447–55. http://dx.doi.org/10.1179/1879139512y.0000000034.

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Nikoosohbat, F., S. Kheirandish, M. Goodarzi, M. Pouranvari, and S. P. H. Marashi. "Microstructure and failure behaviour of resistance spot welded DP980 dual phase steel." Materials Science and Technology 26, no. 6 (June 2010): 738–44. http://dx.doi.org/10.1179/174328409x414995.

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Mishra, A., and S. Thuillier. "Investigation of the rupture in tension and bending of DP980 steel sheet." International Journal of Mechanical Sciences 84 (July 2014): 171–81. http://dx.doi.org/10.1016/j.ijmecsci.2014.04.023.

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Zhang, Yajing, Wenbin Dong, Yinhu Qiao, and Chunyu Zhang. "Edge Effect Investigation of DP980 Steel Sheet in Multiple Laser Scanning Process." International Journal of Precision Engineering and Manufacturing 20, no. 3 (February 15, 2019): 319–26. http://dx.doi.org/10.1007/s12541-019-00086-0.

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Chen, Luzhen, Wenquan Sun, Anrui He, Chao Liu, and Yi Qiang. "Study on quarter-wave generation mechanism in DP980 steel during cold rolling." International Journal of Advanced Manufacturing Technology 120, no. 1-2 (January 31, 2022): 313–27. http://dx.doi.org/10.1007/s00170-021-08395-3.

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Gutierrez, Jon Edward, Jacqueline Noder, and Clifford Butcher. "Experimental Characterization and Deterministic Prediction of In-Plane Formability of 3rd Generation Advanced High Strength Steels." Metals 10, no. 7 (July 6, 2020): 902. http://dx.doi.org/10.3390/met10070902.

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The objective of the current study is to develop a practical, deterministic approach to the prediction of the in-plane formability of two third generation advanced high-strength steels (AHSS) of 980 and 1180 MPa ultimate tensile strength using only quasi-static mechanical property data. The hardening response to large strains was experimentally measured with the use of simple shear and tensile tests and validated in tensile simulations. The process-corrected limit strains in the Nakazima and Marciniak tests were compared to various analytical Forming Limit Curve (FLC) models for in-plane stretching. It was observed that the widely-used Marciniak–Kuczynski model can adequately predict the experimental FLC in biaxial stretching but significantly underestimated the limit strains in uniaxial stretching for both third generation AHSS. The observed through-thickness shear fracture mode in biaxial stretching was reasonably well-captured by the Bressan–Williams (BW) instability model for the 1180 MPa steel. A proposed extension of the BW model to uniaxial tension by adoption of the maximum in-plane shear stress criterion (BWx model) provided superior experimental correlation relative to the zero-extension model of Hill that was too conservative. Finally, a linearized version of the modified maximum force criterion (MMFC) was proposed that markedly improved the correlation with the process-corrected FLC for in-plane stretching of AHSS. The developed framework for FLC prediction was then applied to a DP980 AHSS and an AA5182 aluminum alloy from the literature. The DP980 corroborated the observed trend for the two third generation AHSS whereas the MK and the BWx models performed best for the AA5182 with its saturation-type hardening behavior and non-quadratic yield surface.

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Bang, Junho, Namsu Park, Junghan Song, Hong-Gee Kim, Gihyun Bae, and Myoung-Gyu Lee. "Tool Wear Prediction in the Forming of Automotive DP980 Steel Sheet Using Statistical Sensitivity Analysis and Accelerated U-Bending Based Wear Test." Metals 11, no. 2 (February 10, 2021): 306. http://dx.doi.org/10.3390/met11020306.

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The forming process of ultra-high-strength steel (UHSS) may cause premature damage to the tool surface due to the high forming pressure. The damage to and wear of the tool surface increase maintenance costs and deteriorate the surface quality of the sheet products. Hence, a reliable prediction model for tool wear can help in the efficient management of the quality and productivity of formed sheet products of UHSS. In this study, a methodology is proposed for predicting the wear behavior of stamping tools that are used in the forming process of DP980 steel sheet. Pin-on-disk tests were conducted based on the Taguchi method to develop the tool wear prediction model. Using statistical analysis based on the signal-to-noise (S/N) ratio and ANOVA result, the contact pressure and the sliding distance were selected as the major contact parameters for tool wear. The Archard wear model has a limitation in predicting the nonlinear behavior of tool wear. Therefore, the power-law nonlinear regression model as a function of the contact pressure and the sliding distance was constructed. To verify the reliability of the constructed tool wear prediction model, the U-draw bending tests were designed. The modified U-draw bending test, which accelerates tool wear, is newly designed to evaluate the tool wear for different contact pressures and sliding distances. The modified die generated a contact pressure four times higher than that of the conventional die from the finite element (FE) simulation results. The tool wear prediction model was validated by comparing the predicted results with the experimental results of DP980 sheets formed using the physical vapor deposition (PVD) CrN-coated STD11 tool steel.

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Lim, Sung Jun, and Hoon Huh. "Fracture loci of DP980 steel sheet for auto-body at intermediate strain rates." International Journal of Automotive Technology 18, no. 4 (May 24, 2017): 719–27. http://dx.doi.org/10.1007/s12239-017-0071-z.

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Guo, Wei, Zhandong Wan, Qiang Jia, Lixia Ma, Hongqiang Zhang, Caiwang Tan, and Peng Peng. "Laser weldability of TWIP980 with DP980/B1500HS/QP980 steels: Microstructure and mechanical properties." Optics & Laser Technology 124 (April 2020): 105961. http://dx.doi.org/10.1016/j.optlastec.2019.105961.

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